In a class of 100 students there are 70 boys whose average marks in a subject are 75 If the average ...........

Quantitative Aptitude (CDS) Average

In a class of 100 students, there are 70 boys whose average marks in a subject are 75. If the average marks of the complete class is 72, then what is the average marks of the girls?

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Explanation:

Number of total students = 100
Number of boys = 70
Number of girls = 30
Average of boys = 75
Total marks of boys = 75×70 = 5250
Average of class = 72
Total marks of class = 72×100 = 7200
Average marks of girls = (7200−5250)/30=1950/30=65